With buggraber I caught this error where SilverDragon blocks UI actions due to calling a protected function:

1x [ADDON_ACTION_FORBIDDEN] AddOn 'SilverDragon' tried to call the protected function 'UseAction()'.
[string "@Interface/AddOns/!BugGrabber/BugGrabber.lua"]:480: in function <Interface/AddOns/!BugGrabber/BugGrabber.lua:480>
[string "=[C]"]: in function UseAction' [string "@Interface/FrameXML/SecureTemplates.lua"]:364: in function handler'
[string "@Interface/FrameXML/SecureTemplates.lua"]:690: in function <Interface/FrameXML/SecureTemplates.lua:672>
[string "@Interface/FrameXML/SecureTemplates.lua"]:704: in function <Interface/FrameXML/SecureTemplates.lua:697>
[string "@Interface/FrameXML/SecureTemplates.lua"]:746: in function SecureActionButton_OnClick' [string "@Interface/FrameXML/ActionButton.lua"]:109: in function TryUseActionButton'
[string "@Interface/FrameXML/MultiActionBars.lua"]:22: in function `MultiActionButtonUp'
[string "MULTIACTIONBAR1BUTTON9"]:4: in function <[string "MULTIACTIONBAR1BUTTON9"]:1>

I'm closing this as a duplicate of #185. If you update SilverDragon and still see it happening, please go ahead and reopen it.